HAVE_ZFS=		${MK_LOADER_ZFS}

LOADER_NET_SUPPORT?=	yes
LOADER_NFS_SUPPORT?=	yes
LOADER_TFTP_SUPPORT?=	yes
LOADER_CD9660_SUPPORT?=	yes
LOADER_EXT2FS_SUPPORT?=	no
LOADER_MSDOS_SUPPORT?=	no
LOADER_UFS_SUPPORT?=	yes
LOADER_GZIP_SUPPORT?=	yes
LOADER_BZIP2_SUPPORT?=	yes

.include <bsd.init.mk>

LOADER?=	loader_${LOADER_INTERP}
PROG=		${LOADER}.sym
INTERNALPROG=
NEWVERSWHAT?=	"bootstrap loader" x86
VERSION_FILE?=	${.CURDIR}/../loader/version
#
# There's 640k - 40k maximum space, less however much memory the BIOS uses.  A
# non-random survey suggests that 20k-25k is a good value for 'most' machines.
# We also need to subtract maximum stack usage (20-25k).
#
# So 640k - 40k - 25k - 25k = 550k = 563,200 bytes, but use 560,000 below for
# some extra buffer for more complex setups and/or wider BIOS lomem variation.
#
# Some systems use more stack or have BIOS reserve more RAM (or both), and will
# need to set this lower in /etc/src.conf if the above buffer is too small.
#
# sudo dd if=/dev/mem bs=1 iseek=0x413 count=2 | hd -d
#
# will tell you how many kiB of lomem are available.
#
# We further reduce this to 500k, though, to give PXE an additional 64k of space
# so pxeloader will fit. If you have special needs that do not include pxeboot,
# you can safely set this as high as 560000 generally, or a bit higher if you
# have tight control over the machines you are booting on.
#
LOADERSIZE?=	500000		# Largest known safe size for loader.bin

.PATH:		${BOOTSRC}/i386/loader

# architecture-specific loader code
SRCS+=		chain.c
SRCS+=		conf.c
SRCS+=		gfx_bios.c
SRCS+=		main.c
SRCS+=		vers.c

.if ${MK_LOADER_BIOS_TEXTONLY} == "no"
SRCS+=		gfx_fb.c
SRCS+=		8x16.c

CFLAGS.gfx_fb.c += -I${.CURDIR}/../libi386
CFLAGS.gfx_fb.c += -I$(SRCTOP)/sys/teken
CFLAGS.gfx_fb.c += -I${SRCTOP}/sys/cddl/contrib/opensolaris/common/lz4
CFLAGS.gfx_fb.c += -I${SRCTOP}/contrib/pnglite
CFLAGS.gfx_fb.c += -DHAVE_MEMCPY -I${SRCTOP}/sys/contrib/zlib
CFLAGS.gfx_bios.c += -I$(SRCTOP)/sys/teken
CFLAGS.gfx_bios.c += -I${SRCTOP}/contrib/pnglite
.else
CFLAGS.gfx_bios.c += -DBIOS_TEXT_ONLY
CFLAGS.conf.c	+= -DBIOS_TEXT_ONLY
.endif

# Include bcache code.
HAVE_BCACHE=	yes

# Enable PnP and ISA-PnP code.
HAVE_PNP=	yes
HAVE_ISABUS=	yes

.if ${MK_LOADER_ZFS} == "yes"
CFLAGS.main.c+=	-I${SYSDIR}/contrib/openzfs/include
CFLAGS.main.c+=	-I${SYSDIR}/contrib/openzfs/include/os/freebsd/zfs
.endif

.if exists(${.CURDIR}/help.i386)
HELP_FILES=	${.CURDIR}/help.i386
.endif
HELP_FILENAME=	loader.help.bios

# Always add MI sources
.include	"${BOOTSRC}/loader.mk"

CLEANFILES+=	${LOADER} ${LOADER}.bin 8x16.c

ORG=		0x0

CFLAGS+=	-Wall
LDFLAGS+=	-static ${LDFLAGS_ORG} -Wl,--gc-sections
.if (${LINKER_TYPE} == "lld" && ${LINKER_VERSION} >= 130000) || \
    (${LINKER_TYPE} == "bfd" && ${LINKER_VERSION} >= 23700)
# lld 13 and higher default to garbage collecting start/stop symbols,
# completely ruining our linker sets. For now, work around it by
# disabling this un-feature.
LDFLAGS+=	-Wl,-z,nostart-stop-gc
.endif

# i386 standalone support library
LIBI386=	${BOOTOBJ}/i386/libi386/libi386.a
CFLAGS+=	-I${BOOTSRC}/i386

# Debug me!
#CFLAGS+=	-g
#LDFLAGS+=	-g

8x16.c: ${SRCTOP}/contrib/terminus/ter-u16b.bdf
	vtfontcvt -f compressed-source -o ${.TARGET} ${.ALLSRC}


${LOADER}: ${LOADER}.bin ${BTXLDR} ${BTXKERN}
	btxld -v -f aout -e ${LOADER_ADDRESS} -o ${.TARGET} -l ${BTXLDR} \
		-b ${BTXKERN} ${LOADER}.bin

${LOADER}.bin: ${LOADER}.sym
	${STRIPBIN} -R .comment -R .note -o ${.TARGET} ${.ALLSRC}
	@set -- `ls -l ${.TARGET}` ; x=$$((${LOADERSIZE}-$$5)); \
	    echo "$$x bytes available"; test $$x -ge 0

.if ${MK_LOADER_ZFS} == "yes" && ${LOADER_INTERP} == ${LOADER_DEFAULT_INTERP}
LINKS+=		${BINDIR}/${LOADER} ${BINDIR}/zfsloader
.endif
.if ${LOADER_INTERP} == ${LOADER_DEFAULT_INTERP}
LINKS+=		${BINDIR}/${LOADER} ${BINDIR}/loader
.endif
FILES+=	${LOADER}
FILESMODE_${LOADER}= ${BINMODE} -b

# Note: crt0.o needs to be first for pxeboot(8) to work. It assumes that the
# startup code is located at the start of the loader and will jump
# there. Although btx is more flexible than this, the emulated boot2 environment
# that pxeldr provides has none of that flexibility and assumes the entry point
# is 0. Finally, both pxeldr and cdboot assume they are loading an a.out file.
#
# We must add it to the LDFLAGS instead of the OBJS because the former won't try
# to clean it. When it is in OBJS, this cleaning can lead to races where
# btxcrt.o is rebuilt, but boot2 isn't, leading to errors at installation time.
# LDFLAGS does not have this baggage and will be included first in the list of
# files.
LDFLAGS+=	${BTXCRT}

# Force the linker max page size to 4k so that we fit in the limited space even
# if someone has set a larger default linker max page size via /etc/src.conf.
LDFLAGS+= -Wl,-z,max-page-size=0x1000

DPADD=	${LDR_INTERP32} ${LIBI386} ${LIBSA32}
LDADD=	${LDR_INTERP32} ${LIBI386} ${LIBSA32}

.if ${MACHINE_CPUARCH} == "amd64"
CFLAGS+=	-DLOADER_PREFER_AMD64
.endif

.include <bsd.prog.mk>
